diff --git a/Documentation/git.txt b/Documentation/git.txt
index 0ef7f5e4ecebf5..59f0af73eb9969 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -460,6 +460,14 @@ Environment Variables
 ---------------------
 Various Git commands use the following environment variables:
 
+System
+~~~~~~
+`HOME`::
+	Specifies the path to the user's home directory. On Windows, if
+	unset, Git will set a process environment variable equal to:
+	`$HOMEDRIVE$HOMEPATH` if both `$HOMEDRIVE` and `$HOMEPATH` exist;
+	otherwise `$USERPROFILE` if `$USERPROFILE` exists.
+
 The Git Repository
 ~~~~~~~~~~~~~~~~~~
 These environment variables apply to 'all' core Git commands. Nb: it